Thanks for the rendering.
Is that a wooden crate?
( My knowledge of rifle packing crates, cartons? is limited to what I see in films..i.e. worthless.)
Don't take anything literal from the illustration. I have no idea how the Carcanos were placed in the box. May have been 2 rows of 5 or some other configuration.
I can't prove it to your satisfaction but I believe the Carcanos were shipped in cardboard boxes. This box, for example, could hold ten Carcanos and it claims to hold up to 80 lbs. (
Link ). Back in the 1960s, balled-up newspaper and bagged popcorn or wood chips made lightweight packing material. Maybe a few cardboard cut-outs that supported the rifle inside the box.
Can't see them using wood and all that extra shipping weight for surplus weapons with a small profit margin. Since the container was cardboard, a shipper might be willing to charge "Net Weight" only (weight of goods, excluding container) to secure a contract.